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Re: Weird mammal cladograms, and dino implications
On Mon, 10 May 1999, Thomas R. Holtz, Jr. wrote:
> Despite the mammalian orientation of this post, I get to dinos at the end...
> Waddell, P.J., Okada, N. & Hasegawa, M. 1999. Towards resolving the
> interordinal relationships of placental mammals. Syst. Biol. 48:1-5.
> The "new" view includes some big changes. The basal split is not between
> xenarthrans and epitheres, but between (the ancestrally Gondwanan?) clade
> Atlantogenata and a second assemblage containg Glires,
No mention of the studies that show rabbits to be archontans, close to
Do Guinea pigs and relations fall out in this clade as well?
> Euarchonta (old
> Archonta minus the bats), and the new Laurasiatheria. Atlantogenates are
> the (ancestrally South American?) Xenarthra (sloths, anteaters, armadillos)
> and the recently proposed Afrotheria, containing the golden mole-tenrec
> clade Afrosoricida, elephant shrews, aardvarks, hyaxes, and tethytheres.
Some of this stuff is really weird, but (if you'll excuse the unscientific
sentiment) I've always had a good "feeling" about Afrotheria.
> The laurasiatheres include many of the remaining traditional insectivores
> (true moles, true shrews, soleodons, etc., but hedgehogs may lie outside all
> other placentals!), bats, the cetartiodactyls (more below), and the new
> Zooamata ("animal friends"): perissodactyls, carnivorans, and pangolins.
Perissodactyls, carnivorans, and pangolins???!!! Oy, vay!
> Not addressed in these papers, and something I'd like to see new analyses of
> in light of these topologies, are: the phylogenetic position of the South
> American "ungulates": within Ungulata gone, where the heck do they go?
> Sister group to Xenarthra would be too much to ask...;
Or maybe sister group to Afrotheria, which contains a bunch of
Getting back to dinosaurs, this reminds me of some fascinating stuff I
heard here recently about paleogeography and bird evolution.
Specifically, that cariamas, turacos, caracaras, phorusrhacoids, and
others represent a distincively South American radiation of birds. Do I
have that right?